It is thought that Uffern took on the role that Annwfn/Annwn once played, that of the pagan Otherworld, while also playing the role of the Underworld. In earlier times, they were two distinct ideas; indeed, it is difficult to say if the early Welsh had any concept of a hell under the Druids, who taught reincarnation; as said before, "uffern" is a borrowing of the Latin "inferno." "Hell" is Norse.